scholarly journals Influence of the Pressure of Open-Close Water-Cooled Moulds on Casting/Mould Interface Heat Transfer and Casting Solidification Process

2019 ◽  
Vol 542 ◽  
pp. 012068
Author(s):  
Q H Yao ◽  
Y D Zeng ◽  
L T He ◽  
J Zhang
Keyword(s):  
Heat Transfer ◽  
Solidification Process ◽  
Interface Heat Transfer ◽  
Interface Heat

The Effect of Air Gap between Casting and Water-Cooled Mold on Interface Heat Transfer Coefficient

2017 ◽  
Vol 893 ◽  
pp. 174-180 ◽  
Author(s):  
Yi Dan Zeng ◽  
Qing Hu Yao ◽  
Xia Wang
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Solidification Process ◽  
Casting Process ◽  
Air Gap ◽  
Gap Formation ◽  
Interface Heat Transfer Coefficient ◽  
Interface Heat Transfer ◽  
Interface Heat

Water-cooled casting is a new casting process. It allows even large castings to solidify rapidly, thereby reducing segregation and grain refinement. It has drawn the attention of both domestic and foreign businesses. Heat transfer at the casting/water-cooled mold interface controls the cooling rate of the casting. During the solidification process, because of the contraction that takes place during casting, an air gap can form between the casting and the water-cooled mold. This air gap hinders heat transfer between the casting and the mold, leading to a rapid drop in the interface heat transfer coefficient (IHTC). The purpose of the present study was to assess the effects of the width of the air gap and the duration of gap formation on IHTC. During the experiment, the casting temperature curve was determined in the presence of the interface air gap, and then inverse calculation was performed using PROCAST software to determine the IHTC of casting/water-cooled mold. Results showed that, after the formation of the air gap, IHTC first exhibited a rapid decrease, followed by an increase and then another decrease; IHTC was found to decrease as gap width increased and as the duration of gap formation increased.

scholarly journals Interface Heat Transfer of Horizontal Co-current Liquid-liquid Stratified Flow

1980 ◽  
Vol 23 (177) ◽  
pp. 376-384 ◽  
Author(s):  
Minoru TAKAHASHI ◽  
Akira INOUE ◽  
Masanori ARITOMI ◽  
Shigebumi AOKI
Keyword(s):  
Heat Transfer ◽  
Stratified Flow ◽  
Interface Heat Transfer ◽  
Interface Heat

Determination of the Interface Heat Transfer Coefficient for Non-Isothermal Bulk-Forming Processes

1987 ◽  
Vol 109 (1) ◽  
pp. 49-57 ◽  
Author(s):  
S. L. Semiatin ◽  
E. W. Collings ◽  
V. E. Wood ◽  
T. Altan
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Transfer Coefficients ◽  
Interface Heat Transfer Coefficient ◽  
Bulk Forming ◽  
Interface Heat Transfer ◽  
Aluminum Alloy 2024 ◽  
Interface Heat

Experimental and analytical techniques have been developed for the determination of the interface heat transfer coefficient for nonisothermal bulk-forming processes. A fixture consisting of two flat IN-100 alloy dies was instrumented with high-response thermocouples. With this tooling, heat-transfer experiments were conducted in which (1) the two dies were heated to different temperatures and brought together under varying pressure levels and (2) the two dies were heated to the same temperature and were used to upset an aluminum alloy 2024-0 ring specimen heated to a higher temperature. Data from both sets of tests were analyzed to determine heat-transfer coefficients by using calibration curves derived from analytical and finite-difference method solutions. By this means, the effects of interface pressure, deformation, and deformation rate on the heat-transfer coefficient were established.

scholarly journals Modeling of Multisize Bubbly Flow and Application to the Simulation of Boiling Flows with the Neptune_CFD Code

2009 ◽  
Vol 2009 ◽  
pp. 1-8 ◽  
Author(s):  
Christophe Morel ◽  
Jérôme M. Laviéville
Keyword(s):  
Heat Transfer ◽  
Bubbly Flow ◽  
Bubble Diameter ◽  
Mathematical Expression ◽  
Original Model ◽  
Bubbly Flows ◽  
Condensation Rate ◽  
Interface Heat Transfer ◽  
Interface Heat ◽  
Transfer Term

This paper describes the modeling of boiling multisize bubbly flows and its application to the simulation of the DEBORA experiment. We follow the method proposed originally by Kamp, assuming a given mathematical expression for the bubble diameter pdf. The original model is completed by the addition of some new terms for vapor compressibility and phase change. The liquid-to-interface heat transfer term, which essentially determines the bubbles condensation rate in the DEBORA experiment, is also modeled with care. First numerical results realized with the Neptune_CFD code are presented and discussed.

scholarly journals Interface Heat Transfer of Horizontal Co-current Liquid-liquid Stratified Flow : 2nd Report, Entrance Region

1981 ◽  
Vol 24 (192) ◽  
pp. 1002-1010 ◽  
Author(s):  
Minoru TAKAHASHI ◽  
Akira INOUE ◽  
Shigebumi AOKI ◽  
Masanori ARITOMI ◽  
Hideo ENDO
Keyword(s):  
Heat Transfer ◽  
Stratified Flow ◽  
Entrance Region ◽  
Interface Heat Transfer ◽  
Interface Heat
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